Datasets:
Gugu8
/
Code-Syntax-Expanded

Dataset card Data Studio Files
xet
 Community
1
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
101 values
language
stringclasses
26 values
list.forEach(function(item) {{ console.log(item); }})
list.forEach((item) => {{ console.log(item); }})
Arrow functions are cleaner.
JavaScript
object Item {{ def main(args: Array[String]) = println("value") }}
object Item {{ def main(args: Array[String]): Unit = println("value") }}
Add return type Unit.
Scala
List(70,60,1)
List(70,60,1)
Correct.
Scala
$arr[57]
if ($arr.Count -gt 57) {{ $arr[57] }}
Check bounds.
PowerShell
echo data hello
echo 'data hello'
Quote to prevent splitting.
Shell
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
let temp: i32 = "output";
let temp: &str = "output";
Type mismatch.
Rust
if ($index = 39) {{}}
if ($index -eq 39) {{}}
Use -eq.
PowerShell
<div><p>message</div></p>
<div><p>message</p></div>
Nest properly.
HTML
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
let mut bar=85; let r1=&mut bar; let ref2=&mut bar;
let mut bar=85; {{ let r1=&mut bar; }} let ref2=&mut bar;
Only one mutable borrow.
Rust
package main func main() {{}}
package main import 'fmt' func main() {{}}
Import needed.
Go
'output' + 1
'output' + 1.to_s
Convert int.
Ruby
h1 {{ font-size:17px color:blue; }}
h1 {{ font-size:17px; color:blue; }}
Add semicolon.
CSS
let v=vec![93,10,89]; let first=&v[0]; v.push(3);
let mut v=vec![93,10,89]; let first=v[0]; v.push(3);
Copy instead of reference.
Rust
if (x = 90)
if (x == 90)
Use ==.
Scala
jwt.sign({{id:58}}, 'secret');
jwt.sign({{id:58}}, 'secret', {{expiresIn:'30m'}});
Add expiration.
Node.js
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
let bar = 25; let bar = 78;
let bar = 25; bar = 78;
Duplicate declaration.
JavaScript
while read line; do echo $line; done < log.txt
while read line; do echo $line; done < log.txt
Correct.
Shell
<ul><li>hello<li>hello</ul>
<ul><li>hello</li><li>hello</li></ul>
Close li.
HTML
SELECT age role FROM orders;
SELECT age, role FROM orders;
Add comma.
SQL
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
let str1 = String::from("info"); let s2 = str1; println!("{{}}", str1);
let str1 = String::from("info"); let s2 = str1.clone(); println!("{{}}", str1);
Clone to avoid move.
Rust
<center>result</center>
<div style='text-align:center;'>result</div>
Use CSS.
HTML
local temp = 78
local temp = 78
Correct.
Lua
cin >> item;
int item; cin >> item;
Declare variable.
C++
b > 84 & b < 24
b > 84 and b < 24
Use 'and' not '&'.
Python
if a > 56 print('result')
if a > 56: print('result')
Colon missing after if.
Python
if (c) console.log('yes') else console.log('no')
if (c) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
val count = 12; count = 45
var count = 12; count = 45
Use var for reassignment.
Scala
for (b in items)
for (b of items)
for...in iterates keys.
JavaScript
if count = 36
if count == 36
Use ==.
MATLAB
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
<div color=green>
<div style='color:green;'>
Use style attribute.
CSS
int* p = nullptr; *p=5;
int* p = new int; *p=5;
Allocate memory.
C++
for (int i=0; i<59; i++) {{}}
for (int i=0; i<59; i++) {{}}
Correct.
Java
int list[81]; list[81]=5;
int list[81]; if(81<81){{}} else list[81]=5;
Bounds check.
C++
result = hello
result = 'hello'
Quote strings.
Python
$x = 5; print $x
$x = 5; print $x;
Missing semicolon.
Perl
if (index = 49)
if (index == 49)
Use ==.
R
{{'name':14, 'value' 74}}
{{'name':14, 'value':74}}
Colon missing.
Python
<note><desc>info</desc><age>1</age></note
<note><desc>info</desc><age>1</age></note>
Add closing >.
XML
SELECT COUNT(*) FROM products
SELECT COUNT(*) FROM products;
Missing semicolon.
SQL
function baz(x:string){{return x;}} baz(53);
function baz(x:string){{return x;}} baz('message');
Pass correct type.
TypeScript
class Person def method end end
class Person def method end end
Correct.
Ruby
<table><tr><td>test<td>test</tr></table>
<table><tr><td>test</td><td>test</td></tr></table>
Close td.
HTML
fmt.Println 'result'
fmt.Println('result')
Missing parentheses.
Go
while foo > 55 foo -= 1
while foo > 55: foo -= 1
Colon missing after while.
Python
print 'result'
print('result')
print needs parentheses.
Python
if z = 49:
if z == 49:
Use == for comparison.
Python
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
p {{ color: blue }}
p {{ color: blue; }}
Add semicolon.
CSS
const obj:Person = {{name:'output'}};
const obj:Person = {{name:'output', age:41}};
Add missing property.
TypeScript
JOIN profiles ON users.id = profiles.email
JOIN profiles ON users.id = profiles.email
Correct.
SQL
disp('hello')
disp('hello')
Correct.
MATLAB
Post.save();
Post.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
[x*x for x in items if x > 9]
[x*x for x in items if x > 9]
Correct list comprehension.
Python
yield foo
yield foo
Correct yield.
Python
'80' + 93
80 + 93
Avoid string coercion.
JavaScript
fn baz() -> i32 {{ 7 }}
fn baz() -> i32 {{ 7 }}
Correct.
Rust
if bar = 44 {{}}
if bar == 44 {{}}
Use ==.
Swift
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
var a int = 'result'
var a string = 'result'
Type mismatch.
Go
let item: number | null = null; item.toFixed(15);
let item: number | null = null; if(item!==null) item.toFixed(15);
Null check.
TypeScript
<img src='result.jpg'>
<img src='result.jpg' alt='desc'>
Add alt text.
HTML
my @arr = (17,55,54);
my @arr = (17,55,54);
Correct.
Perl
print 'hello'
print('hello')
Parentheses for function call.
Lua
foo
foo()
Add parentheses.
Kotlin
$result = 54; if ($result = 54) {{}}
$result = 54; if ($result == 54) {{}}
Use ==.
PHP
String name = 'info';
String name = 'info';
Correct.
Dart
{{"id":"result" "age":9}}
{{"id":"result", "age":9}}
Add comma.
JSON
<input type='text' value='info'>
<input type='text' value='info' name='id'>
Add name attribute.
HTML
int y = 'output';
String y = 'output';
Type mismatch.
Dart
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
print 'result'
print 'result';
Add semicolon.
Perl
{{"status":"data",}}
{{"status":"data"}}
Remove trailing comma.
JSON
<user name='test'/>
<user name="test"/>
Double quotes.
XML
{ "name": "result" }
{ "name": "result" }
Correct.
JSON
print 'data'
print('data')
print needs parentheses.
Python
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
<?php // code ?>
<?php // code ?>
Correct.
PHP
let foo = 34; foo += 1;
let mut foo = 34; foo += 1;
Need mut to modify.
Rust
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
function process(): void {{ return 27; }}
function process(): number {{ return 27; }}
Return type mismatch.
TypeScript
arr.forEach(function(c) {{ console.log(c); }})
arr.forEach((c) => {{ console.log(c); }})
Arrow functions are cleaner.
JavaScript
with open('data.txt') as file_handle: data = file_handle.read()
with open('data.txt') as file_handle: data = file_handle.read()
Correct.
Python
for result in range(43) print(result)
for result in range(43): print(result)
Colon after for.
Python
function compute(result:string){{return result;}} compute(83);
function compute(result:string){{return result;}} compute('value');
Pass correct type.
TypeScript
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
if b = 25
if b == 25
Use ==.
MATLAB
Write-Host 'test'
Write-Host 'test'
Correct.
PowerShell
$a = 9; if ($a = 9) {{}}
$a = 9; if ($a == 9) {{}}
Use ==.
PHP
raise 'info'
raise Exception('info')
Raise needs an exception class.
Python
disp('output')
disp('output')
Correct.
MATLAB
compute
compute()
Add parentheses.
Swift
List<int> list = [1,2,3];
List<int> list = [1,2,3];
Correct.
Dart
switch(bar){{ case 57: break; }}
switch(bar){{ case 57: break; default: break; }}
Add default case.
Java